The Signal Analysis app allows you to import, analyze, and manipulate signals, filters, and spectra.

The Filter Design and Analysis app allows you to design ,import, and analyze digital FIR and IIR filters.

The Window Design and Analysis app helps you to analyze and design spectral windows.

Apps are interactive MATLAB programs you can use without writing any code. Most toolboxes come with apps, and you can download more for free from the MATLAB File Exchange. You can also package and share your own apps.